perl update query errors [duplicate] - bash

Question

i want to insert a query but not work :
my $query1 = $db1->prepare("SELECT host, name, severity FROM XX");
my $query2 = $db2->prepare('UPDATE worldmap_table' . ' SET severity = ?, name = ? WHERE HOST = ?');
$query1->execute;
while (my #row = $query1->fetchrow_array) {
$query2->execute($row[2]);
print "$row[2]\n";
}
preparation query 3
my $query3 = $db1->prepare("SELECT host, name, severity
FROM XX);
preparation query 4
my $query4 = $db2->prepare('UPDATE worldmap_table' . ' SET severity = 6, name = ? WHERE HOST = ?');
$query3->execute;
this part not work
while (my #row2 = $query3->fetchrow_array) {
$query4->execute($row2[2], $row2[1], $row2[0]);
print "$row2[2], $row2[1], $row2[0] \n";
}
i have this error:
DBD::mysql::st execute failed: called with 3 bind variables when 2 are needed at worldmap2.pl line 103.
DBD::mysql::st execute failed: called with 3 bind variables when 2 are needed at worldmap2.pl line 103.

Answer 1

There are two placeholders in query 4:
my $query4 = $db2->prepare(
'UPDATE worldmap_table' . ' SET severity = 6, name = ? WHERE HOST = ?'
# ~ ~
);
But you're calling it with only one argument:
$query4->execute($row2[2]);
# ~~~~~~~~
The error message mentions different numbers, so I guess you simplified the code.